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Marine Weather and Tide Forecast for Onset, MA

April 21, 2025 7:59 AM EDT (11:59 UTC) Change Location
Sunrise 5:52 AM   Sunset 7:32 PM
Moonrise 2:45 AM   Moonset 12:09 PM 
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NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

Marine Forecasts
   
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NOTE: Zones were updated 3/20/2025
ANZ234 Buzzards Bay- 704 Am Edt Mon Apr 21 2025

Today - NE winds around 5 kt, becoming S this afternoon. Seas 1 foot or less. Wave detail: N 1 foot at 4 seconds and sw 1 foot at 7 seconds.

Tonight - S winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 1 foot or less, then around 2 ft after midnight. Wave detail: S 1 foot at 3 seconds and ne 1 foot at 5 seconds, becoming S 2 ft at 3 seconds and ne 1 foot at 5 seconds. Showers likely after midnight.

Tue - SW winds around 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave detail: S 2 ft at 4 seconds and ne 1 foot at 5 seconds. Patchy fog. A chance of showers in the morning. Vsby 1 to 3 nm.

Tue night - SW winds 10 to 15 kt with gusts up to 20 kt, becoming nw 5 to 10 kt after midnight. Seas around 2 ft. Wave detail: sw 2 ft at 6 seconds and W 1 foot at 3 seconds. Patchy fog in the evening.

Wed and Wed night - W winds 5 to 10 kt. Seas 1 foot or less. Wave detail: nw 1 foot at 3 seconds and sw 1 foot at 6 seconds.

Thu through Fri - S winds 5 to 10 kt. Seas 1 foot or less. Wave detail: nw 1 foot at 2 seconds and sw 1 foot at 5 seconds.

Fri night - S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers.
seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.
ANZ200 704 Am Edt Mon Apr 21 2025

Synopsis for massachusetts and rhode island coastal waters - High pres builds over the region today, with a warm front moving through into Tue. Cold front moves through Tue night with another high pres arriving for Wed. High pres maintains control through Thu. Periodic chances for rainfall Fri through next weekend.

7 Day Forecast for Marine Location Near Onset, MA
   
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Tide / Current for Onset Beach, Onset Bay, Buzzards Bay, Massachusetts
  
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Tide / Current data from XTide NOT FOR NAVIGATION        
  Sorry, Onset Beach, Onset Bay, Buzzards Bay, Massachusetts does not exist in database. Press Edit above and select a valid nearby location.

Onset Beach, Onset Bay, Buzzards Bay, Massachusetts, Tide feet

Tide / Current for Cape Cod Canal, Massachusetts Current
  
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Cape Cod Canal
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Mon -- 12:39 AM EDT     3.21 knots Max Flood
Mon -- 02:44 AM EDT     Moonrise
Mon -- 03:56 AM EDT     -0.14 knots Slack
Mon -- 05:52 AM EDT     Sunrise
Mon -- 07:15 AM EDT     -3.80 knots Max Ebb
Mon -- 10:16 AM EDT     0.17 knots Slack
Mon -- 12:09 PM EDT     Moonset
Mon -- 01:24 PM EDT     3.64 knots Max Flood
Mon -- 05:11 PM EDT     -0.16 knots Slack
Mon -- 07:30 PM EDT     Sunset
Mon -- 07:55 PM EDT     -3.52 knots Max Ebb
Mon -- 10:52 PM EDT     0.02 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
        
  Sorry, Cape Cod Canal, Massachusetts Current does not exist in database. Press Edit above and select a valid nearby location.

Cape Cod Canal, Massachusetts Current, knots
12
am
3.1
1
am
3.2
2
am
2.8
3
am
2
4
am
-0.5
5
am
-2.4
6
am
-3.3
7
am
-3.8
8
am
-3.6
9
am
-2.9
10
am
-1.4
11
am
2.2
12
pm
3.2
1
pm
3.6
2
pm
3.6
3
pm
3.2
4
pm
2.5
5
pm
1
6
pm
-2.3
7
pm
-3.2
8
pm
-3.5
9
pm
-3.2
10
pm
-2.3
11
pm
0.9

Area Discussion for Boston, MA
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FXUS61 KBOX 210712 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 312 AM EDT Mon Apr 21 2025

SYNOPSIS
High pressure will bring dry conditions with less wind today.
Scattered showers return tonight into early Tuesday as a warm front moves through. Dry conditions with above normal temperatures expected Tuesday afternoon into Friday. A frontal system may bring more showers Friday night into Saturday, then drying out next Sunday as this system moves offshore.

NEAR TERM /THROUGH TODAY/
Key Messages:

* Dry and mild today with sea-breezes developing

High pressure moves offshore today. Light N to NW winds gradually become Light S to SE winds by late morning. Dry weather expected through most of today. Near normal high temperatures along both immediate coasts, with above normal highs across the interior. Increasing clouds this afternoon. Low risk for very late day spotty showers across far NW Massachusetts.

SHORT TERM /TONIGHT THROUGH 6 PM TUESDAY/
Key Messages:

* Scattered showers developing tonight then moving offshore Tuesday * Well above normal high temperatures expected Tuesday

High pressure over the North Atlantic continues to move farther offshore tonight. A low pressure moving into the Great Lakes should first push a warm front across our region, which will provide the first chance for showers. While there is some elevated instability, am thinking the forcing is too weak to support thunderstorms past sunset. These showers could linger across the Cape and islands after daybreak Tuesday, while drier weather is anticipated elsewhere.

This will be followed by the weakening cold front of this system. Thus, expecting southern New England to remain in more of a warm sector environment Tuesday. Once the sunshine breaks out, there should be a rather significant warm up, at least away from the Cape and islands. Still contending with water temperatures in the mid 40s there.

LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/
Key Messages:

* Mainly dry Wednesday and Thursday with temperatures slightly above normal.

* Pattern becomes more unsettled Friday through the weekend with periodic chances for precipitation.

Tuesday Night through Weekend:

A cold front moves through Tuesday night into early Wednesday morning. Wednesday trends slightly cooler than Tuesday, although still warmer than normal overall. Highs range in the 50s for the Cape/Island and 60s for the interior. Light NW winds expected under broad high pressure with localized sea breezes in the afternoon for the coastal areas.

A similar pattern stays in place through the end of the week with zonal flow and 850mb temperature anomalies signaling at slightly above normal temperatures. Ensemble guidance shows a transition to a more unsettled pattern Friday into the weekend.
Heights fall across the region ahead of an upper level trough moving over the Great Lakes. A weaker leading shortwave moves through Friday evening with the main trough moving through by the end of the weekend. This will bring a few rounds of precipitation. Still need to iron out the details with the timing/chances of the first wave of showers on Friday. A more consistent round of rain moves in overnight through Saturday.
Temperatures range around normal. Conditions gradually dry out Sunday.

AVIATION /06Z MONDAY THROUGH FRIDAY/
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.

Today...High Confidence.

VFR. Light to calm winds early. Sea-breezes developing along the east coast of MA 13-15z. Otherwise, wind becoming S 10-15 kt this afternoon.

Tonight...High confidence in trends. Moderate confidence in timing.

VFR this evening, lowering to MVFR-IFR from W to E after 05z.
Scattered showers developing.

Tuesday...High confidence in trends. Moderate confidence in timing.

MVFR/IFR to start, then transitioning to VFR by late morning across most of the region. VFR more likely to develop in the early afternoon for the Cape and islands. S to SW winds 10-15 kt.

KBOS TAF...High confidence in TAF.

KBDL TAF...High confidence in TAF.

Outlook /Tuesday Night through Friday/...

Tuesday Night: VFR. Breezy.

Wednesday through Thursday Night: VFR.

Friday: VFR. Slight chance SHRA.

MARINE
Forecaster Confidence Levels:

Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.

Through Tuesday...High Confidence.

Rather tranquil boating conditions across the waters today and tonight. Increasing S to SW winds Tuesday ahead of a dissipating cold front approaching the waters. This could lead to marginally rough seas across portions of the southern outer coastal waters.
Risk for some showers with reduced visibility after midnight.
These showers are expected to move east of the waters by Tuesday afternoon, but could leave some patch fog in their wake.

Outlook /Tuesday Night through Friday/...

Tuesday Night: Winds less than 25 kt. Seas locally approaching 5 ft.

Wednesday through Thursday Night: Winds less than 25 kt.

Friday: Winds less than 25 kt. Slight chance of rain showers.

BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.


Weather Reporting Stations
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Stations Dist Age Wind AirWater WavesinHgDewPt
BZBM3 - 8447930 - Woods Hole, MA 15 mi60 min 46°F 48°F30.36
NBGM3 15 mi60 minNNE 2.9G5.1 46°F 30.37
44090 19 mi60 min 44°F 43°F1 ft
44020 - NANTUCKET SOUND 26 mi50 minN 7.8G9.7 47°F 47°F30.3434°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 27 mi60 minNE 1.9G2.9 46°F 30.37
FRVM3 - 8447386 - Fall River, MA 27 mi60 min 44°F 50°F30.37
FRXM3 28 mi60 min 45°F 26°F
44085 31 mi60 min 46°F 46°F2 ft
BUZM3 - Buzzards Bay, MA 31 mi60 minNE 7G8 30.37
CPTR1 - 8452944 - Conimicut Light, RI 36 mi60 minNNE 2.9G2.9 45°F 51°F30.37
NAXR1 - Narragansett Bay Reserve, RI 37 mi75 minESE 4.1 42°F 30.3628°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 37 mi60 minENE 2.9G6 46°F 30.35
CHTM3 38 mi60 min 47°F 30.36
PVDR1 38 mi60 minNNE 1.9G4.1 46°F 30.37
NWPR1 - 8452660 - Newport, RI 39 mi60 minNNE 5.1G7 46°F 48°F30.36
FOXR1 - 8454000 - Providence, RI 40 mi60 minNNE 1G2.9 47°F 46°F30.36
PDVR1 41 mi60 minNW 1.9G2.9 44°F 30.3524°F
QPTR1 - 8454049 - Quonset Point, RI 41 mi60 minN 2.9G5.1 44°F 43°F30.37
44013 - BOSTON 16 NM East of Boston, MA 42 mi40 minN 3.9G5.8 43°F 43°F1 ft30.3633°F
NTKM3 - 8449130 - Nantucket Island, MA 43 mi60 minNNE 5.1G9.9 48°F 51°F30.36
BHBM3 - 8443970 - Boston, MA 47 mi60 min 46°F 30.35


Wind History for Borden Flats Light at Fall River, MA
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Boston, MA,





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